Đặt câu với từ "asbestos packing"
1. Stems shall be of dezincification-resistant silicon bronze ASTM B 371 or low-zinc alloy B non-asbestos packing and malleable or ductile iron handwheel.
1. Stems shall be of dezincification-resistant silicon bronze ASTM B 371 or low-zinc alloy B non-asbestos packing and malleable or ductile iron handwheel.